Is it kinda a metallic color blue-black? Try a paste of cream of tarter and water and see if that works. If you noticed color coming off on the rag or whatever you were using then it removed the finish. Good luck.

Lime away is an acid & it turns steel black. Use something like barkeeper's friend or bon-ami & a non abrasive scrubber cloth. It will return it to the original finish. Acid works for aluminum, but not for steel. I have had this happen to me, also.